Atistick bitumen surfaced building material



W' 194. J, H. YQUNG Er AL 2,440,626

ANTISTIGK BITUMEN SURFACED BUILDING MATERIAL Filed April 22, 1942 INVENTORS.

, are sold in corrugated form and in Patented Apr.' 27, I1948 James Howard Young and Paul W. Jenkins, Pitts-` burgh,

Pa., assignors to H. pany, Pittsburgh, Pa. vania.

H. Robertson Coma corporation of Pennsyl- Applcation April 22, 19424, Serial No. 439,994

3 Claims.

this specication.

In the drawings Figs. 1 and 2 are sectional views illustrating two forms of building materials embodying the invention.

The protected metal sheets forming the subject matter useful as roong and siding sheets building purposes. In most instances the sheets lengths varying from six to ten feet. In order to provide alginates having incorporated therein soap .to reduce the surface tension of the solution and glycerine to impart flexibility to the resulting alginate llm. The commercially obtainable 6 alginates are contaminated with variable amounts ject to decomposition upon storage.

In accordance With the present invention the buildingfmaterial, having a bituminous or other protected metal sheets 20 anti-stick coating having a plasticized Water :soluble cellulose ether as The Water soluble cellulose ether may weather-proong coating.

As an example of an anti-stick coating composition embodying this invention that has been 55 found to be effective when applied in aqueous The nlm Ill deposited from such solution imparts a clear, high gloss finish to the surface of the Weather-proofing coating protected metal building sheet i4. `'The film l0.

serves eiiectively as an anti-stick permitting shipment of the material under various conditions of temperature and exposed surface after erection sheet without the development of unsightly discoloration in the process and possesses enough flexibility and distensibility to reduce to ;a 4minimum the effects of differential movement of the nlm and the underlying bituminous coating under varying temperature and humidity changes.

While Vfor some purposes Vsoap may be used to lower the surface tension in the production of the present anti-stick composition having the Water soluble cellulose ethers as its base, lnevertheless experience has demonstrated that soap imparts suicient opacity to the lm to give a whitish color to the underlying bituminous Weather proofing surface, particularly whenever more than a minimum thickness of anti-stick coating is applied. The presence of the soap in the lm makes the surfaces of the building material extremely slippery when Wet, a condition which has'been found to constitute a severe hazard to construction men when erecting roong sheets during unfavorable Weather. It hasvbeen found that wetting agents of the type represented by such materials as a sodium salt of sulphated heptadecanol .are effective in amounts too small to 'have any vaplcireciable yinfluence on characteristics of the dried nlm. In such formulation, the superior lm characteristics of methyl cellulose as compared with the alginates is particularly noticeable, permitting of the development of more exible and distensible coatings by addition of plasticizers without sacrifice of anti-stick qualities. We have employed glycerine as the plasticizer in our tests, .and also other polyhydrio alcoho-ls as glycol, diethylene glycol, and the like.

While the Vpreferred embodiment of the invention has been ,illustrated and described, it will be I2 of the metal cored'4 V humidity. It Weathers ofi the y of the building j "nousr coating comprising understood that the invention may be embodied in other forms within the scope of the following claims.

Having thus described the invention, What is claimed is:

1. A building materialhaving a .normally tacky bituminous surf ace and an anti-stick coating lm covering the normally tacky surface, said coat- 4ing film comprising Parts Methyl cellulose 2 Glycerine l Sodium salt of sulphated heptadecanol 1/4 2. As aynew article of manufacture a protected metal building sheet having a metal core sheet and an outer Weather-proong bituminous coating and an anti-stick film covering said bitumi- Parts Methyl cellulose 2 Glycerine 1 Sodium salt of sulphated heptadecanol -1/4 3. As a new article of manufacture, a protected metal-building sheet for Vroofing and Vsidingpurposes having a metal core sheet and .anouter weather-proofing ,bituminous coating, and an anti-stick film covering said bituminous coating and consisting of a major proportion of va water soluble cellulose ether, a minor proportion of a. Water soluble polyhydric alcohol -vplast'icizer therefor, and a very small proportionof a .wetting agent consisting of a `sodium salt of .sulphated heptadecanol.

i JAMES HOWARD YOUNG.

VPAUL W. JENKINS.

REFERENCES CITED The following references are of record in :the le of this patent:

UNITED, STATES PATENTS 2,306,887 Klose Dec. 29, 1942 

